Tunnel of Eupalinos
E671984
The Tunnel of Eupalinos is an ancient Greek underground aqueduct on the island of Samos, renowned as a remarkable feat of 6th-century BCE engineering for its precise construction from both ends of a mountain.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Tunnel of Eupalinos canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T7539300 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Tunnel of Eupalinos Context triple: [Pythagoreio, contains, Tunnel of Eupalinos]
-
A.
Kavala Aqueduct
The Kavala Aqueduct is a prominent historic Roman and Ottoman-era water bridge in the Greek city of Kavala, known for its impressive multi-arched structure dominating the urban skyline.
-
B.
Cacor aqueduct
The Cacor aqueduct is a historic French water bridge that carries the Canal de Garonne over the Tarn River near Moissac.
-
C.
Heptastadion causeway
The Heptastadion causeway was an ancient engineering structure in Alexandria that linked the mainland to Pharos Island, helping form the city’s famous twin harbors.
-
D.
Aqueduct of Pitigliano
The Aqueduct of Pitigliano is a historic Renaissance-era aqueduct in the Tuscan hill town of Pitigliano, Italy, notable for its striking arches integrated into the town’s dramatic tufa cliffs.
-
E.
Lune Aqueduct
Lune Aqueduct is a historic 18th-century stone aqueduct in Lancaster, England, renowned for carrying the canal high over the River Lune with a series of impressive arches.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Tunnel of Eupalinos Target entity description: The Tunnel of Eupalinos is an ancient Greek underground aqueduct on the island of Samos, renowned as a remarkable feat of 6th-century BCE engineering for its precise construction from both ends of a mountain.
-
A.
Kavala Aqueduct
The Kavala Aqueduct is a prominent historic Roman and Ottoman-era water bridge in the Greek city of Kavala, known for its impressive multi-arched structure dominating the urban skyline.
-
B.
Cacor aqueduct
The Cacor aqueduct is a historic French water bridge that carries the Canal de Garonne over the Tarn River near Moissac.
-
C.
Heptastadion causeway
The Heptastadion causeway was an ancient engineering structure in Alexandria that linked the mainland to Pharos Island, helping form the city’s famous twin harbors.
-
D.
Aqueduct of Pitigliano
The Aqueduct of Pitigliano is a historic Renaissance-era aqueduct in the Tuscan hill town of Pitigliano, Italy, notable for its striking arches integrated into the town’s dramatic tufa cliffs.
-
E.
Lune Aqueduct
Lune Aqueduct is a historic 18th-century stone aqueduct in Lancaster, England, renowned for carrying the canal high over the River Lune with a series of impressive arches.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
ancient Greek structure
ⓘ
aqueduct ⓘ tunnel ⓘ |
| alsoKnownAs | Eupalinian aqueduct NERFINISHED ⓘ |
| approximateConstructionDate | around 550–530 BCE ⓘ |
| builtFor | tyranny of Polycrates NERFINISHED ⓘ |
| constructedInCentury | 6th century BCE ⓘ |
| constructedUnder | Polycrates of Samos NERFINISHED ⓘ |
| constructionMethod | dug from both ends of the mountain ⓘ |
| country | Greece ⓘ |
| culturalPeriod | Archaic Greece NERFINISHED ⓘ |
| designedBy | Eupalinos of Megara NERFINISHED ⓘ |
| discovered | re-explored in modern times in the 19th century ⓘ |
| engineeringType | hydraulic engineering ⓘ |
| excavationTechnique | hand tools ⓘ |
| function | gravity-fed water conveyance ⓘ |
| GreekName | Ευπαλίνιον Όρυγμα NERFINISHED ⓘ |
| hasFeature |
central tunnel
ⓘ
inspection shafts ⓘ lower water channel ⓘ |
| hasSlope | slight gradient for water flow ⓘ |
| height | about 1.8 meters ⓘ |
| heritageStatus | UNESCO World Heritage Site component ⓘ |
| languageOfName | Greek ⓘ |
| length | approximately 1036 meters ⓘ |
| locatedIn | Samos NERFINISHED ⓘ |
| locatedNear | Pythagoreion NERFINISHED ⓘ |
| locatedOn | island of Samos NERFINISHED ⓘ |
| material |
limestone
ⓘ
local rock ⓘ |
| namedAfter | Eupalinos of Megara NERFINISHED ⓘ |
| notableFor |
advanced ancient surveying techniques
ⓘ
precision of alignment from two excavation fronts ⓘ |
| orientation | roughly north–south ⓘ |
| partOf | Pythagoreion and Heraion of Samos NERFINISHED ⓘ |
| passesThrough | Mount Kastro NERFINISHED ⓘ |
| preservation | partially restored ⓘ |
| purpose |
aqueduct for ancient city of Samos
ⓘ
water supply ⓘ |
| recognizedAs | one of the great engineering achievements of antiquity ⓘ |
| status | partially accessible to visitors ⓘ |
| surveyingMethod | geometric and trigonometric planning ⓘ |
| tourism | important archaeological attraction on Samos ⓘ |
| UNESCOInscriptionYear | 1992 ⓘ |
| UNESCOSiteType | cultural ⓘ |
| waterDestination | ancient city of Samos ⓘ |
| waterSource | Agadiki spring NERFINISHED ⓘ |
| width | about 1.8 meters ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Tunnel of Eupalinos Description of subject: The Tunnel of Eupalinos is an ancient Greek underground aqueduct on the island of Samos, renowned as a remarkable feat of 6th-century BCE engineering for its precise construction from both ends of a mountain.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.